It has been brought to the attention of the PLOS ONE editors that substantial parts of the text in this article were appropriated from text in the following publications: Identification and biochemical characterization of small-molecule inhibitors of Clostridium botulinum neurotoxin serotype A. Roxas-Duncan V, Enyedy I, Montgomery VA, Eccard VS, Carrington MA, Lai H, Gul N, Yang DC, Smith LA. Antimicrob Agents Chemother. 2009 Aug;53(8):3478-86 Eubanks LM, Hixon MS, Jin W, Hong S, Clancy CM, et al. (2007) An in vitro and in vivo disconnect uncovered through high-throughput identification of botulinum neurotoxin A antagonists. Proc Natl Acad Sci USA104: 2602–2607. PLOS ONE therefore retracts this article due to the identified case of plagiarism. PLOS ONE apologizes to the authors of the publications above and to the readers.